[ our genshin murders ]

... Hm.

In Wiwaldi, though we would oft have more than one death per week, 'twas only one of them that involved a compelled killer. [ unless i'm misremembering help ] Assuming 'tis the same here, we already know Kazunari was the one to be afflicted the previous week... So it may be safe to believe Kaeya acted of his own volition.